<template>
  <div class="create-post-page">
    <h4>{{ isEditMode ? "编辑文章" : "新建文章" }}</h4>
    <uploader
      action="/upload"
      :beforeUpload="uploadCheck"
      @file-uploaded="handleFileUploaded"
      :uploaded="uploadedData"
      class="d-flex align-items-center justify-content-center bg-light text-secondary w-100 my-4"
    >
      <h2>点击上传头图</h2>
      <template #loading>
        <div class="d-flex">
          <div class="spinner-border text-secondary" role="status">
            <span class="sr-only">Loading...</span>
          </div>
          <h2>正在上传</h2>
        </div>
      </template>
      <template #uploaded="dataProps">
        <div class="uploaded-area">
          <img :src="dataProps.uploadedData.data.url" alt="" />
          <h3>点击重新上传</h3>
        </div>
      </template>
    </uploader>
    <validate-form @form-submit="onFormSubmit">
      <div class="mb-3">
        <label class="form-label">文章标题：</label>
        <validate-input
          :rules="titlesRules"
          v-model="titleVal"
          placeholder="请输入文章标题"
          type="text"
        >
        </validate-input>
      </div>
      <div class="mb-3">
        <label class="form-label">文章详情：</label>
        <validate-input
          rows="10"
          tag="textarea"
          placeholder="请输入文章详情"
          :rules="contentRules"
          v-model="contentVal"
        />
      </div>
      <template #submit>
        <button class="btn btn-primary btn-large">
          {{ isEditMode ? "更新文章" : "发表文章" }}
        </button>
      </template>
    </validate-form>
  </div>
</template>

<script lang="ts">
import { defineComponent, ref, onMounted } from "vue";
import { useStore } from "vuex";
import { useRouter, useRoute } from "vue-router";
import { GlobalDataProps, PostProps, ResponseType, ImageProps } from "../store";
import ValidateInput, { RulesProp } from "../components/ValidateInput.vue";
import ValidateForm from "../components/ValidateForm.vue";
import Uploader from "../components/Uploader.vue";
import createMessage from "../components/createMessage";
import { beforeUploadCheck } from "../helper";
export default defineComponent({
  name: "CreatePost",
  components: {
    ValidateInput,
    ValidateForm,
    Uploader
  },
  setup() {
    const uploadedData = ref();
    const titleVal = ref("");
    const router = useRouter();
    const route = useRoute();
    const isEditMode = !!route.query.id;
    const store = useStore<GlobalDataProps>();
    let imageId = "";
    const titleRules: RulesProp = [
      { type: "required", message: "文章标题不能为空" }
    ];
    const contentVal = ref("");
    const contentRules: RulesProp = [
      { type: "required", message: "文章详情不能为空" }
    ];
    onMounted(() => {
      if (isEditMode) {
        store
          .dispatch("fetchPost", route.query.id)
          .then((rawData: ResponseType<PostProps>) => {
            const currentPost = rawData.data;
            if (currentPost.image) {
              uploadedData.value = { data: currentPost.image };
            }
            titleVal.value = currentPost.title;
            contentVal.value = currentPost.content || "";
          });
      }
    });
    const handleFileUploaded = (rawData: ResponseType<ImageProps>) => {
        if (rawData.data._id) {
            imageId = rawData.data._id
        }
    }
    const onFormSubmit = (result: boolean) => {
        if (result) {
            const { column, _id } = store.state.user
            if (column) {
                const newPost: PostProps = {
                    title: titleVal.value,
                    content: contentVal.value,
                    column,
                    author: _id
                }
                if (imageId) {
                    newPost.image = imageId
                }
                const actionName = isEditMode ? 'updatePost' : 'createPost'
                const sendData = isEditMode ? {
                    id: route.query.id,
                    payload: newPost
                } : newPost
                store.dispatch(actionName, sendData).then(() => {
                    createMessage('发表成功，2秒后跳转到文章', 'success', 2000)
                    setTimeout(() => {
                        router.push({ name: 'column', params: { id: column }})
                    }, 2000);
                })
            }
        }
    }
    const uploadCheck = (file: File) => {
        const result = beforeUploadCheck(file, { format: ['image/jpeg', 'image/png'], size: 1})
        const { passed, error } = result
        if (error === 'format') {
            createMessage('上传图片只能是 JPG/PNG 格式！', 'error')
        }
        if (error === 'size') {
            createMessage('上传图片大小不能超过1Mb', 'error')
        }
        return passed
    }
    return {
        titleRules,
        titleVal,
        contentVal,
        contentRules,
        onFormSubmit,
        uploadCheck,
        handleFileUploaded,
        uploadedData,
        isEditMode
    }
  }
})
</script>

<style scoped>
.create-post-page .file-upload-container {
    height: 200px;
    cursor: pointer;
    height: hidden;
}
.create-post-page .file-upload-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.uploaded-area {
    position: relative;
}
.uploaded-area:hover h3 {
    display: block;
}
.uploaded-area h3 {
    display: none;
    position: absolute;
    color: #999;
    text-align: center;
    width: 100%;
    top: 50%;
}
</style>
